;ALP for addition of 2 digit numbers
section .data

msg db 'Enter two digit Number::',0xa
msg_len equ $-msg
res db 10,'Addition of two digit numbers is:'
res_len equ $-res
section .bss
num resb 03
num1 resb 01
result resb 04

section .text

%macro print 2
mov rax,1 ; Function 1 - write
mov rdi,1 ; To stdout
mov rsi,%1 ; String address
mov rdx,%2 ; String size
syscall ; invoke operating system to WRITE
%endmacro

%macro read 2
mov rax,0 ; Function 0 - Read
mov rdi,0 ; from stdin
mov rsi,%1 ; buffer address
mov rdx,%2 ; buffer size
syscall ; invoke operating system to READ
%endmacro

global _start
_start:

xor rax,rax
xor rbx,rbx
xor rcx,rcx
xor rdx,rdx
mov byte[result],0
mov byte[num],0
mov byte[num1],0
print msg, msg_len
read num,3
call convert
mov [num1],bl
print msg, msg_len
read num,3
call convert
xor rcx,rcx
xor rax,rax
mov rax,[num1]
add rax, rbx
mov [result],rax
print res, res_len
mov rbx,[result]
call display
mov rax,60
mov rdi,0
syscall
convert: ;; ASCII to Hex conversion
xor rbx,rbx
xor rcx,rcx
xor rax,rax
mov rcx,02
mov rsi,num
up1:
rol bl,04
mov al,[rsi]
cmp al,39h
jbe p1
sub al,07h
jmp p2
p1: sub al,30h
p2: add bl,al
inc rsi
loop up1
ret
display: ;; Hex to ASCII conversion
mov rcx,4
mov rdi,result
dup1:
rol bx,4
mov al,bl
and al,0fh
cmp al,09h
jbe p3
add al,07h
;jmp p4
p3: add al,30h
p4:mov [rdi],al
inc rdi
loop dup1
print result,4
ret